We present a spectroscopic redshift of z=1.675 for the well-known multiply lensed system of arcs seen in the z=0.39 cluster Cl 0024+16. In contrast to earlier work, we find that the lensed images are accurately reproduced by a projected mass distribution which traces the locations of the brightest cluster elliptical galaxies, suggesting that the most significant minima of the cluster potential are not dynamically erased. The averaged mass profile is shallow and consistent with predictions of recent numerical simulations. The source redshift enables us to determine an enclosed cluster mass of M(<100 kpc h-1&parr0;=1.11+/-0.03x1014 h-1 M middle dot in circle (Omega=1) and a mass-to-light ratio of M&solm0;LB(<100 kpc h-1&parr0;=320+/-30 h &parl0;M&solm0;LB&parr0; middle dot in circle (virtually independent of curvature), after correction for passive stellar evolution. The arc spectrum contains many ionized absorption lines and closely resembles that of the local Wolf-Rayet galaxy NGC 4217. Our lens model predicts a high magnification ( approximately 20) for each image and identifies a new pair of multiple images of a galaxy at a predicted redshift of z=1.3.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1086/312651 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The James Webb Space Telescope has discovered a surprising population of bright galaxies in the very early Universe (≲500 Myr after the Big Bang) that is hard to explain with conventional galaxy-formation models and whose physical properties are not fully understood. Insight into their internal physics is best captured through nebular lines, but at these early epochs, the brightest of these spectral features are redshifted into the mid-infrared and remain elusive. Using the mid-infrared instrument onboard the James Webb Space Telescope, here we present a detection of Hα and doubly ionized oxygen ([O iii] 4959,5007 Å) from the bright, ultra-high-redshift galaxy candidate GHZ2/GLASS-z12.
View Article and Find Full Text PDFSynthesis and Optical Properties of -Arylnaphtho- and Anthra[2,3-]oxazol-2-amines.
Molecules
January 2025
School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan.
Oxazole, a versatile and significant heteroarene, serves as a bridge between synthetic organic chemistry and applications in the medicinal, pharmaceutical, and industrial fields. Polycyclic aromatic compounds with amino groups substituted at the 2-position of an oxazole, such as 2-aminonaphthoxazoles, are expected to be functional probes, but their synthetic methods are extremely limited. Herein, we describe electrochemical reactions of 3-amino-2-naphthol or 3-amino-2-anthracenol and isothiocyanates in DMSO, using a graphite electrode as an anode and a platinum electrode as a cathode in the presence of potassium iodide (KI), which afford -arylnaphtho- and -arylanthra[2,3-]oxazol-2-amines via cyclodesulfurization.
View Article and Find Full Text PDFFluorometric Turn Off Detection of Cu and Pd Ions Using 1-(Imidazo[5,1-a]isoquinolin-3-yl)naphthalen-2-ol.
Luminescence
January 2025
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India.
The fused heterocycle 1-(imidazo[5,1-a]isoquinolin-3-yl)naphthalen-2-ol (LH) has been synthesized and characterized by spectroscopic methods. Probe LH upon irradiation with λ = 336 nm exhibited strong fluorescence with λ = 437 nm in MeOH/HEPES buffer (5 mM, pH = 7.4, 2:8, v/v).
View Article and Find Full Text PDFAnnealing Effect on Linear and Ultrafast Nonlinear Optical Properties of BiTe Thin Films.
Materials (Basel)
December 2024
Department of Optical Science and Engineering, Shanghai Ultra-Precision Optical Manufacturing Engineering Center, Fudan University, Shanghai 200433, China.
In recent years, the fabrication of materials with large nonlinear optical coefficients and the investigation of methods to enhance nonlinear optical performance have been in the spotlight. Herein, the bismuth telluride (BiTe) thin films were prepared by radio-frequency magnetron sputtering and annealed in vacuum at various temperatures. The structural and optical properties were characterized and analyzed using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, spectroscopic ellipsometry, and UV/VIS/NIR spectrophotometry.
View Article and Find Full Text PDFAromatic pi-complexation of 1,5-diisocyanonaphthalene with benzene derivatives.
Sci Rep
January 2025
Institute of Chemistry, University of Miskolc, Miskolc-Egyetemváros, Miskolc, 3515, Hungary.
Aromatic π-complexes play a significant role in various chemical and biological systems, significantly influencing their physico-chemical and spectroscopic properties. The identification of new compounds capable of π-complex formation is therefore of great interest. The paper investigates the fluorescent properties of 1,5-diisocyanonaphthalene (1,5-DIN) in different aromatic solvents, demonstrating its potential for distinguishing between aromatics based on emission spectra.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!